Despite the introduction of revolutionary man-made fabrics, plain woven cotton is still used in large quantities for electrical insulation, coil winding, and as component in transformers. Close weave, plain woven cotton tapes are used to wrap armatures, field coils, field coil supports, and transformer windings. Very strong and cost effective. These materials are also used to wrap cables, in electrical appliances, and as a sacrificial item in resin or shellac coating processes. This is an ASTM Type 1 material.